JPS5822814B2 - Manufacturing method of magnetic head - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing a magnetic head.

A widely used conventional magnetic head of this type is a laminated ring type magnetic head as shown in FIG.

This magnetic head is first made by punching magnetic plywood into a predetermined shape.
These are laminated to a predetermined thickness to form two core pieces A1 and A2.
After winding coils B1 and B2 around this, the gap forming surface is polished.

Next, the gap forming surfaces are butted against each other by sandwiching the spacer C to fix both core pieces AI and A2, and then a step of polishing the tape running surface is completed.

However, with this manufacturing method, it is difficult to determine whether the magnetic head is good or bad until the magnetic head is assembled and the tape running surface is polished.

In particular, the quality of the gap is the biggest factor in determining the electrical characteristics, but the fact that it is not possible to determine the quality of the gap until the magnetic head is completed means that the product goes all the way to the final manufacturing process without even knowing it is defective. As a result, the yield rate of the product was poor and there was a huge loss in terms of cost.

Furthermore, since the gap depth accuracy is affected by the accuracy of the core pieces AI and A2, it is impossible to correct this later.

In order to solve the above-mentioned drawbacks, the present invention aims to provide a method for manufacturing a magnetic head in which a magnetic head is configured by a combination of a front core and a back core, and which enables mass production of front cores at one time. It is something to do.

The present invention will be described in detail with reference to an illustrated embodiment. As shown in FIG. 3, a magnetic head 1 includes a front core 2 and a bank core 3.
It is composed of a combination of

The front core 2 is manufactured as follows.

That is, as shown by A in FIG. 2, a plurality of magnetic blocks 4a are formed in the same shape.

4b, 4c...... each block 4a, 4b.

4c...... A gap spacer 5 is provided between them to connect them in series.

With small tiles, magnetic blocks 4a, 4b, 4c...
. . . may be made of laminated magnetic plywood or ferrite, and the gap spacer 5 may be formed by interposing a spacer or depositing a non-magnetic metal as in general use.

Next, as shown in the figure, magnetic blocks 4a are connected in series.

Both sides of 4b, 4c...
In reality, non-magnetic plates 6 a and 6 b made of alumina or the like are attached to the upper and lower surfaces (or only one surface is sufficient) for reinforcement and are integrated.

The non-magnetic plates 6a and 6b are magnetic blocks 4aj4bj4
It is attached to the side surface near the tape running surface 7 of c........ in the connecting direction.

These integrated magnetic blocks 4 a , 4 b , 4
c・・・・・・・・・・・・・・・ is tape running surface 7
After polishing, the opposite side of the tape running surface 7 of each gap spacer 5 is cut out in a groove shape to form a groove depth, as shown by the dashed line in FIG.

By cutting at the center of 4b, 4c, etc., a front core 2 as shown in FIG. 2 is obtained.

Thus, as shown in Fig. 3, the magnetic head 1 is obtained by assembling the back core 3 to the front core 2 and winding the coil (not shown), and then final polishing the tape running surface to complete the process. That's what I do.

The present invention can of course be applied to the manufacture of a stereo magnetic head, and FIG. 4 shows a side view of the finished product.

In the figure, 8 and 9 are upper and lower magnetic heads, which include the front core 2a of the upper magnetic head 8 and the lower magnetic head 9.
The front core 2b is integrally manufactured by the method described above.

3a and 3b are the back cores of the upper and lower magnetic heads 8 and 9, respectively, 10 is a shield plate, and 11a and 11b are coils. The parts are shown.

The present invention divides the magnetic head 1 into a front core 2 and a back core 3 diagonally upward, and the front cores 2.2a, 2b
are magnetic blocks 4a having the same shape.

4b, 4c...... each block 4a, 4b.

4c......Gap spacer 5 is provided between them to connect them in series, and a non-magnetic plate O is provided on the side surface near the tape running surface 7 in the direction of connection.
a.

After attaching and integrating the magnetic blocks 4a, 4b, 4c, the opposite side of each gap 5 from the tape running surface is cut into a groove shape, and each magnetic block 4a, 4b, 4c...・・・
It is formed by cutting at the center.

Therefore, since a large number of front cores 2 can be produced at the same time, mass production of the magnetic head 1 is possible.

Furthermore, since the gap can be formed separately from the back core 3, manufacturing becomes easier and manufacturing costs can be reduced.

Furthermore, since the gap depth can be formed by cutting the rear part of the gap spacer 5 into a groove shape, the accuracy of the gap depth can be improved, and since the quality of the gap can be determined before the magnetic head is completed, the end stop is also improved. .

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing a conventional magnetic head, Fig. 2 is a manufacturing process diagram of a front core to which the manufacturing method according to the present invention is applied, and Fig. 3 is a completed perspective view of a magnetic head manufactured by the same method. , FIG. 4 shows a side view of a stereo magnetic head made by the same method. 1.8, 9...Magnetic head, 2, 2a, 2b.
...Front core, 3, 3a, 3b... Back core, 4 a, 4 b t 4 c... Magnetic block, 5... Gap spacer, 6a, 6
b...Nonmagnetic plate.

Claims (1)

[Claims] 1 Magnetic blocks of the same shape are connected in series with a gap spacer between each block, and a non-magnetic plate is attached to the side surface of each block near the tape running surface in the direction of connection, and then integrated. A method for manufacturing a magnetic head, in which a front core is obtained by cutting the opposite side of each gap spacer from the tape running surface into a groove shape and cutting at the center of each block, and a back core is assembled to the front core.